// Check cases where index scans are aborted due to the collection being dropped.  SERVER-4400

t = db.jstests_queryoptimizer3;
t.drop();

p = startParallelShell( 'for( i = 0; i < 400; ++i ) { sleep( 50 ); db.jstests_queryoptimizer3.drop(); }' );

for( i = 0; i < 100; ++i ) {
    t.drop();
    t.ensureIndex({a:1});
    t.ensureIndex({b:1});
    for( j = 0; j < 100; ++j ) {
        t.save({a:j,b:j});
    }

    try {
        m = i % 5;
        if ( m == 0 ) {
            t.count({a:{$gte:0},b:{$gte:0}});
        }
        else if ( m == 1 ) {
            t.find({a:{$gte:0},b:{$gte:0}}).itcount();
        }
        else if ( m == 2 ) {
            t.remove({a:{$gte:0},b:{$gte:0}});
        }
        else if ( m == 3 ) {
            t.update({a:{$gte:0},b:{$gte:0}},{});
        }
        else if ( m == 4 ) {
            t.distinct('x',{a:{$gte:0},b:{$gte:0}});
        }
    }
    catch (e) {
        print("Op killed during yield: " + e.message);
    }
}

p();

// Ensure that the server is still responding.
assert.commandWorked(db.runCommand({isMaster: 1}));
